Marine Electrical Systems USCG Question #1190 (Set 40)

By what means is the rotation of a three-phase induction motor reversed?

Official USCG Answer & Rule Citation

Correct Answer: Option B — interchanging any two of the three line leads to the stator

Reversing the direction of rotation in a three-phase induction motor is achieved by swapping any two of the three stator supply leads. This action reverses the phase sequence of the rotating magnetic field, which in turn reverses the direction of the torque exerted on the rotor, as dictated by fundamental electromagnetic principles.

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